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2.
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Nominal longitudinal parameters for the LHC beam in the CERN SPS
/ Baudrenghien, P ; Bohl, T (CERN) ; Linnecar, Trevor Paul R ; Shaposhnikova, Elena ; Tückmantel, Joachim
A proton beam with the basic structure defined by the the LHC requirements, was first available for injection into the SPS in 1998. At the end of 2002, following a significant beam-studies and RF hardware upgrade programme, a beam having both the nominal LHC intensity and the correct longitudinal parameters was obtained at top energy for the first time. [...]
LHC-Project-Report-652; CERN-LHC-Project-Report-652.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3050
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3.
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The PS 13.3-20 MHZ RF Systems for LHC
/ Garoby, R ; Grier, D G ; Haase, M ; Krusche, A ; Maesen, P ; Morvillo, M ; Paoluzzi, M ; Rossi, C
As part of the preparation of the PS as an injector for the LHC, a prototype 20 MHz rf system has been used, to demonstrate that the nominal longitudinal performance of the proton beam for LHC can be obtained using multiple bunch-splittings. Based on these successful results obtained during 2000, the development of the operational rf system began in 2001. [...]
LHC-Project-Report-651; CERN-LHC-Project-Report-651.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1724
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4.
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Waveguide Mode Reflectometry for Obstacle Detection in the LHC Beam Pipe Including Signal Attenuation
/ Kroyer, Tom ; Caspers, Friedhelm ; Mahner, Edgar
Unexpected obstacle formation in the LHC beam-pipe during assembly, cool down and operation may lead to major disturbances. Thus a fast, precise, sensitive and reliable means to detect and characterize such a fault is highly desirable, preferably without the need to break the vacuum. [...]
LHC-Project-Report-650; CERN-LHC-Project-Report-650.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2700
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8.
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Correcting the LHC beta* at Collision
/ Verdier, A ; Wittmer, W ; Zimmermann, Frank
To correct the beta* at the main collision points (IP1 and IP5) simultaneously for the two counterrotating proton beams in the Large Hadron Collider (LHC), a set of specific quadrupoles in the non-common part of the machine is used. Due to the antisymmetric optics, several quadrupoles on each side of the insertion have to be employed. [...]
LHC-Project-Report-647; CERN-LHC-Project-Report-647.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2237
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9.
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Energy deposition limits in a Nb$_{3}$Sn separation dipole placed in front of the LHC high-luminosity inner triplet
/ Kashikhin, V V ; Brüning, Oliver Sim ; Mokhov, N V ; Rakhno, I L ; Ruggiero, F ; Strait, J B ; Yadav, S ; Zlobin, A V
/CERN-US LHC Construction Collaboration
Interaction region inner triplets are among the systems which may limit the LHC performance. An option for a new higher luminosity IR is a double-bore inner triplet with separation dipoles placed in front of the first quadrupole. [...]
LHC-Project-Report-646; FERMILAB-Conf-2003-083; CERN-LHC-Project-Report-646.-
Geneva : CERN, 2003 - 5 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1748
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10.
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Present Understanding of Electron Cloud Effects in the Large Hadron Collider
/ Arduini, Gianluigi ; Baglin, V ; Benedetto, Elena ; Cimino, R ; Collier, Paul ; Collins, I R ; Cornelis, K ; Henrist, Bernard ; Hilleret, Noël (CERN) ; Jenninger, B et al.
We discuss the predicted electron cloud build up in the arcs and the long straight sections of the LHC, and its possible consequences on heat load, beam stability, long-term emittance preservation, and vacuum. Our predictions are based on computer simulations and analytical estimates, parts of which have been benchmarked against experimental observations at the SPS..
LHC-Project-Report-645; CERN-LHC-Project-Report-645.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1727
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11.
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On-line Monitoring of the Linear Coupling Resonances for the LHC
/ Catalan-Lasheras, N ; Fartoukh, Stéphane David ; Koutchouk, Jean-Pierre
Before correction, the difference coupling coefficient in LHC is expected to reach 0.2 at injection and vary by 30 to 40% from injection to top energy. These high values arise mostly from the field imperfections in the super-conducting dipoles, the feed-down from the parasitic sextupoles and the strongly-focused low-beta insertions. [...]
LHC-Project-Report-644; CERN-LHC-Project-Report-644.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2225
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12.
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Towards a new LHC Interaction Region design for a luminosity upgrade
/ Strait, J (Fermilab) ; Lamm, M (Fermilab) ; Limon, P (Fermilab) ; Mokhov, N V (Fermilab) ; Sen, T (Fermilab) ; Zlobin, A V (Fermilab) ; Brüning, Oliver Sim (CERN) ; Ostojic, R (CERN) ; Rossi, L (CERN) ; Ruggiero, F (CERN) et al.
After the LHC operates for several years at nominal parameters, it will be necessary to upgrade it for higher luminosity. Replacing the low-beta insertions with a higher performance design based on advanced superconducting magnets is one of the most straightforward steps in this direction. [...]
LHC-Project-Report-643; CERN-LHC-Project-Report-643.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF;
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.42-4
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13.
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Heavy Ion Beams in the LHC
/ Jowett, John M (CERN) ; Jeanneret, J B (CERN) ; Schindl, K (CERN)
In addition to protons, the LHC will collide beams of heavy ions. The beam intensity in the LHC ring is tightly constrained from below by beam instrumentation (visibility on the beam position monitors in partiuclar) and from above by magnet quench limits, the capabilities of the injectros and beam lifetime. [...]
LHC-Project-Report-642; CERN-LHC-Project-Report-642.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1682
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14.
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Protection Devices in the Transfer Lines to the LHC
/ Burkhardt, H ; Goddard, G ; Mertens, V
Beams will be transferred from SPS to LHC through two transfer lines, each of over 2.5 km length, equipped with conventional resistive magnets with relatively small apertures. Beam energy densities will be roughly 4 orders of magnitude above the LHC quench limit and about one order above damage level. [...]
LHC-Project-Report-641; CERN-LHC-Project-Report-641.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1721
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16.
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A Demonstration of High-Gradient Acceleration
/ Achard, Claude (CERN) ; Braun, Hans Heinrich (CERN) ; Döbert, Steffen (CERN) ; Syratchev, I V (CERN) ; Taborelli, M (CERN) ; Wilson, Ian H (CERN) ; Wuensch, Walter (CERN)
One priority of the CLIC (Compact Linear Collider) accelerating-structure development program has been to investigate ways to achieve accelerating gradients above 150 MV/m. Two main concepts to achieve such high gradients have emerged: reduced surface field geometries and the use of alternative materials. [...]
CERN-AB-2003-048-RF; CLIC-Note-569.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.495
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17.
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Construction and Testing of a 21 GHz Ceramic Based Power Extractor
/ Newsham, D (DULY Res. Inc., Rancho Palos Verdes) ; Braun, H (CERN) ; Carron, G (CERN) ; Döbert, Steffen (CERN) ; Gai, W (Argonne) ; Konecny, R (Argonne) ; Liu, W (Argonne) ; Smirnov, A Yu (DULY Res. Inc., Rancho Palos Verdes) ; Thorndahl, L (CERN) ; Wilson, Ian H (CERN) et al.
A ceramic based power extractor [1] operating at 21 GHz was built by DULY Research Inc. and tested at CTF2, the CERN Linear Collider (CLIC) Test Facility. [...]
CERN-AB-2003-047-RF; CLIC-Note-568.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1156
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18.
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All Digital IQ Servo-System for CERN Linacs
/ Rohlev, A ; Serrano, J ; Garoby, R
A new VME based system has been developed and built at CERN for the servo loops regulating the field in the linac accelerating structure. It makes use of high speed digital In-phase/Quadrature (IQ) detection, digital processing, and digital IQ modulation. [...]
CERN-AB-2003-046-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2336
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19.
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Progress in the Design of a Damped and Tapered Accelerating Structure for CLIC
/ Raguin, J Y (CERN) ; Wilson, Ian H (CERN) ; Wuensch, Walter (CERN)
Two of the main requirements for CLIC 30 GHz accelerating structures are an average accelerating gradient of 150 MV/m and features which suppress long-range transverse and longitudinal wakefields. The main effects that constrain the design of a copper structure are a surface electric field limit of about 300 MV/m, from evidence produced by the CLIC high-gradient testing program, and a pulsed surface heating temperature rise limit estimated to be of the order of 100 K. [...]
CERN-AB-2003-045-RF; CLIC-Note-567.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2724
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21.
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Bunch Frequency Multiplication in the CLIC Test Facility CTF3
/ Tecker, F A (CERN) ; Corsini, R (CERN) ; Rinolfi, Louis (CERN) ; Biscari, C (Frascati) ; Ghigo, A (Frascati) ; Preger, M (Frascati) ; Royer, P (Lausanne U.) ; Ferrari, A (Uppsala U.)
The aim of the CLIC Test Facility CTF3 at CERN is to prove the feasibility of key issues of the two-beam based Compact Linear Collider (CLIC) study. In particular, it addresses the generation of a drive beam with the appropriate time structure to produce high power RF pulses at a frequency of 30 GHz. [...]
CERN-AB-2003-042-OP; CLIC-Note-565.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.684
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22.
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Tools for Predicting Cleaning Efficiency in the LHC
/ Assmann, R W ; Baishev, I S ; Brugger, M ; Hayes, M ; Jeanneret, J B ; Kain, V ; Kaltchev, D I ; Schmidt, F
/CERN-Russia Collaboration ; LHC Construction Canadian Collaboration
The computer codes SIXTRACK and DIMAD have been upgraded to include realistic models of proton scattering in collimator jaws, mechanical aperture restrictions, and time-dependent fields. These new tools complement long-existing simplified linear tracking programs used up to now for tracking with collimators. [...]
LHC-Project-Report-639; CERN-LHC-Project-Report-639.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3494
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23.
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The LHC Proton Beam in the CERN SPS : an Update
/ Arduini, Gianluigi ; Baudrenghien, P ; Bohl, T (CERN) ; Collier, Paul ; Cornelis, K ; Höfle, Wolfgang ; Linnecar, Trevor Paul R ; Shaposhnikova, Elena ; Tückmantel, Joachim ; Wenninger, J
During the 2001 run the beam-induced electron-cloud, generating dramatic vacuum pressure increases and fast transverse instabilities, was the main limitation in the achievement of the nominal LHC beam intensity in the SPS. Nominal longitudinal and transverse parameters at the extraction energy (450 GeV) could be achieved only with a single batch and with a maximum bunch population of 0.5×10^11 p. [...]
LHC-Project-Report-638; CERN-LHC-Project-Report-638.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1718
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24.
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The Electron Cloud Instability of the LHC Beam in the CERN SPS
/ Arduini, Gianluigi ; Cornelis, K ; Höfle, Wolfgang ; Rumolo, Giovanni ; Zimmermann, Frank
The electron cloud induced by the LHC beam in the SPS occurs mainly in the dipoles and it is responsible for strong transverse instabilities. In the horizontal plane a coupled bunch mode instability develops in a few tens of turns at injection. [...]
LHC-Project-Report-637; CERN-LHC-Project-Report-637.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3038
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25.
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Final Results on the CERN PS Electrostatic Septa Consolidation Program
/ Borburgh, Jan ; Balhan, Bruno ; Bobbio, Piero ; Carlier, Etienne ; Hourican, Michael ; Masson, Thierry ; Müller, Tania ; Prost, Antoine ; Crescenti, Massimo
The CERN PS electrostatic septum consolidation program is coming to completion after almost 4 years of development. The program was started to fulfil the increased requirements on vacuum performance and the need to reduce the time necessary for maintenance interventions. [...]
CERN-AB-2003-041-BT.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1643
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26.
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Upgrades to the Digital Receiver based Low-Intensity Beam Diagnostics for CERN AD
/ Angoletta, Maria Elena ; Belohrad, D ; Bojtar, L ; Findlay, A ; Ludwig, M ; Marqversen, O ; Pedersen, F
The CERN AD Low-Intensity Beam Multi-Diagnostics (LIMD) has been upgraded as planned since 2001 by adding tune measurements during ramps and plateaus, based on the Beam Transfer Function (BTF) method. This relies on transversally exciting the beam by a deflector and deriving the BTF and coherence function from FFTs of excitation and beam response recorded by digital receivers (DRX). [...]
CERN-AB-2003-040-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2461
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28.
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Comparison of the TESLA, NLC and CLIC Beam-Collimation System Performance
/ Walker, N (DESY) ; Kozanecki, Witold (Saclay) ; Napoly, O (Saclay) ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN) ; Drozhdin, A I (Fermilab) ; Mokhov, N V (Fermilab) ; Keller, L (SLAC) ; Markiewicz, T W (SLAC) ; Maruyama, T (SLAC) et al.
This report describes studies performed in the framework of the Collimation Task Force organized to support the work of the second International Linear Collider Technical Review Committee. The post-linac beam-collimation systems in the TESLA, JLC/NLC and CLIC linear-collider designs are compared using the same computer code under the same assumptions. [...]
CERN-AB-2003-038-ABP; CLIC-Note-586.-
Geneva : CERN, 2004 - 4 p.
- Published in : AIP Conf. Proc.: 693 (2004) , pp. 200-204
Access to fulltext document: PDF; External link: Published version from AIP
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2739
29th ICFA Advanced Beam Dynamics Workshop on Beam-Halo Dynamics, Diagnostics and Collimation in conjunction with The Beam-Beam Workshop, Montauk, NY, USA, 19 - 23 May 2003, pp.200-204
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29.
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Beam-Beam Interaction, Electron Cloud and Intrabeam Scattering for Proton Super-bunches
/ Ruggiero, F ; Zimmermann, Frank ; Rumolo, Giovanni ; Papaphilippou, Y
Super-bunches are long bunches with a flat longitudinal profile, which could potentially increase the LHC luminosity in a future upgrade. We present example parameters and discuss a variety of issues related to such superbunches, including beam-beam tune shift, tune footprints, crossing schemes, luminosity, intrabeam scattering, and electron cloud. [...]
CERN-AB-2003-037-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF;
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.123-5
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31.
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Simulation Study of Coupled-Bunch Instabilities due to Resistive Wall, Ions, or Electron Cloud
/ Zimmermann, Frank ; Fukuma, H ; Ohmi, K ; Ohnishi, Y ; Win, S S
We simulate the interaction of a bunch train with either an external wake field, (semi-)trapped ions in a field-free region or in a dipole field, or an electron cloud, on successive turns, using a simplified algorithm with only a small number of macro-particles. We present simulated mode spectra and rise times for the ensuing coupled-bunch instabilities, and show that observations at the KEKB HER are consistent with a horizontal instability driven by carbon monoxide ions in a region without magnetic field..
CERN-AB-2003-035-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3056
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36.
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2002 Nonlinear Optics Measurements and Modelling for the CERN SPS
/ Faus-Golfe, Angeles ; Tomas, Rogelio ; Arduini, Gianluigi ; Zimmermann, Frank
In 2002, nonlinear chromaticity, coupling, amplitude-dependent detuning, chromatic phase advance, resonance driving terms, and off-energy orbits were measured in the CERN SPS at 26 GeV/c. The optics model has been updated by adjusting the strengths of nonlinear field errors in the dipoles and quadrupoles, so as to reproduce the measured nonlinear chromaticity. [...]
CERN-AB-2003-030-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2240
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38.
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Damping Ring to Interaction Point Beam Transport Issues
/ Walker, N (DESY) ; Schulte, Daniel (CERN) ; Wolski, A (LBL, Berkeley) ; Tenenbaum, P G (SLAC) ; Seryi, Andrei (SLAC) ; Woodley, M (SLAC)
One of the major challenges facing the proposed high-energy linear e^+e^ colliders is the preservation of the extremely small vertical emittance from the damping rings to the interaction point (IP). This emittance must be transported through bunch compression sections, the main linac and finally through the beam delivery system to the IP. [...]
CERN-AB-2003-028-ABP; CLIC-Note-584.-
Geneva : CERN, 2003 - 6 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.657
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39.
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Effects of Dynamic Misalignements and Feedback Performance on Luminosity Stability in Linear Colliders
/ Seryi, Andrei (SLAC) ; Hendrickson, L ; Raubenheimer, T O ; Tenenbaum, P G ; Woodley, M ; Schulte, Daniel (CERN)
The performance of high energy linear colliders depends critically on the stability with which they can maintain the collisions of nanometer-size beams. Ground motion and vibration, among other effects, will produce dynamic misalignments which can offset the beams at the collision point. [...]
CERN-AB-2003-027-ABP; CLIC-Note-583.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.662
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43.
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Nonlinear Resonance Benchmarking Experiment at the CERN Proton Synchrotron
/ Hofmann, I ; Franchetti, Giuliano (GSI, Darmstadt) ; Giovannozzi, Massimo ; Martini, M ; Métral, Elias
As a first step of a space charge - nonlinear resonance benchmarking experiment over a large number of turns, beam loss and emittance evolution were measured over 1 s on a 1.4 GeV kinetic energy flat-bottom in the presence of a single octupole. By lowering the working point towards the resonance a gradual transition from a loss-free core emittance blow-up to a regime dominated by continuous loss was found. [...]
CERN-AB-2003-023-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.129
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44.
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Measurements of Transverse Space-Charge Effects in the CERN Proton Synchrotron
/ Giovannozzi, Massimo ; Martini, M ; Métral, Elias ; Métral, G (CERN) ; Steerenberg, R
Several beam dynamics codes are used in the design of the next generation of high beam power accelerators. They are all capable of simulating the full six-dimensional motion through a machine lattice in the presence of strong space-charge effect and beam-to-wall interaction. [...]
CERN-AB-2003-022-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2916
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46.
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Nonlinear Optimization of a Low Emittance CLIC Damping Ring Lattice
/ Korostelev, Maxim S (CERN) ; Zimmermann, Frank (CERN)
The CLIC damping ring design is optimized to produce a beam with ultra low emittances. The lattice for such a machine requires a small value of the optical functions, a large number of compact arc cells and, for the chromatic correction, strong sextupoles, that introduce significant nonlinearities, decreasing the dynamic aperture. [...]
CERN-AB-2003-020-ABP; CLIC-Note-564.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2315
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47.
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Parallel Computation of Beam-Beam Interactions including Longitudinal Motion
/ Herr, Werner ; Jones, F W
In beam-beam macroparticle simulations for collider rings, the accurate determination of the incoherent spectrum and potentially unstable coherent modes requires (1) large numbers of collisions, and (2) accurate electric field solutions at each collision. On single processor, a self consistent simulation typically uses a 2D model of the beam-beam interaction in order to achieve a reasonable computation time, however for the long (~0.3m) bunches in the LHC we wish to include the 3rd dimension in order to account for effects such as longitudinal motion, crossing angle, and the beam size and density variations. [...]
CERN-AB-2003-019-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3404
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49.
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Optics Studies for the CERN Proton Synchrotron Machine : Linear and Nonlinear Modelling using Beam Based Measurements
/ Cappi, R (CERN) ; Giovannozzi, Massimo ; Martini, M ; Métral, Elias ; Métral, G (CERN) ; Steerenberg, R ; Müller, A S
The CERN Proton Synchrotron machine is built using combined function magnets. The control of the linear tune as well as the chromaticity in both planes is achieved by means of special coils added to the main magnets, namely two pole-face-windings and one figure-of-eight loop. [...]
CERN-AB-2003-017-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2913
- Please contact the library if you need to access this document.
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50.
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Coherent tune shifts measured with few bunches in the SPS and comparison with resistive wall theory
/ Burkhardt, H (CERN) ; Koschik, A ; Rumolo, Giovanni (CERN) ; Zimmermann, Frank (CERN) ; Zotter, Bruno W (CERN)
Coherent tune shifts with current have been measured in the SPS with single bunches and two bunches at varying distances between them. The measurements showed the usual negative slope with intensity in the vertical plane and a small positive one in the horizontal direction. [...]
CERN-AB-2003-014-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3044
- Please contact the library if you need to access this document.
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52.
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Optimum Choice of RF Frequency for Two Beam Linear Colliders
/ Braun, Hans Heinrich (CERN) ; Schulte, Daniel (CERN)
Recent experimental results on normal conducting RF structures indicate that the scaling of the gradient limit with frequency is less favourable than what was believed. We therefore reconsider the optimum choice of RF frequency and iris aperture for a normal conducting, two-beam linear collider with E_CMS=3 TeV, a loaded accelerating gradient of 150 MV/m and a luminosity of 8 10^34 cm-^2 s^-1. [...]
CERN-AB-2003-012-ABP; CLIC-Note-563.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2721
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53.
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Colliding Nanobeams in CLIC with Magnets Stabilized to the Sub-nm Level
/ Redaelli, Stefano (CERN) ; Guignard, G (CERN) ; Assmann, R W (CERN) ; Schulte, D (CERN) ; Coosemans, W (CERN) ; Wilson, I (CERN) ; Zimmermann, F (CERN)
The Compact Linear Collider (CLIC) aims at colliding e^+e^- beams at 1:5 TeV with effective transverse spot sizes of 60nm (horizontal) times 0:7nm (vertical). Strict stability tolerances must be respected in order to achieve a sufficient overlap of the two colliding beams [...]
CERN-AB-2003-011-ABP; CLIC-Note-562.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.665
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54.
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Operation of the LEP CW Klystrons in Pulsed Mode
/ Frischholz, Hans ; Valuch, D
For possible future accelerator projects, as, e. g., the Super-Conducting Proton Linac, SPL, at CERN, it would be desirable to reuse as much of the LEP/RF equipment as possible. [...]
CERN-AB-2003-043-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF PS; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1089
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55.
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Bench Measurements of Low Frequency Transverse Impedance
/ Caspers, Friedhelm (CERN) ; Iriso-Ariz, U (BNL, Upton, New York) ; Mostacci, A (Univ. Roma)
For frequencies below 10 MHz the classical two wire transmission line method is subject to difficulties in sensitivity and measurement uncertainties. Thus for evaluation of the low frequency transverse impedance properties of the LHC dump kicker a modified version of the two wire transmission line has been used. [...]
CERN-AB-2003-051-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1801
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56.
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LHC beam dumping system : Extraction channel layout and acceptance
/ Goddard, B (CERN) ; Gyr, M (CERN) ; Uythoven, J (CERN) ; Veness, R (CERN) ; Weterings, W (CERN)
The LHC beam dumping system must safely abort the LHC beams under all conditions, including those resulting from abnormal behaviour of machine elements or subsystems of the beam dumping system itself. The extraction channels must provide sufficient aperture both for the circulating and extracted beams, over the whole energy range and under various beam parameters. [...]
LHC-Project-Report-654; CERN-LHC-Project-Report-654.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1646
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57.
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Adiabatic Beam Trapping in Stable Islands of Transverse Phase Space : Measurement Results at CERN Proton Synchrotron
/ Cappi, R (CERN) ; Giovannozzi, Massimo (CERN) ; Martini, M (CERN) ; Métral, M (CERN) ; Métral, G (CERN) ; Steerenberg, R (CERN) ; Müller, A S (ISS, Forschungszentrum Karlsruhe, Germany)
Recently a novel approach to the problem of multi-turn extraction was proposed. It consists of splitting the beam by adiabatic capture inside stable islands created in the transverse phase space by sextupoles and octupoles. [...]
CERN-AB-2003-015-ABP.-
Geneva : CERN, 2003 - 3 p.
Access to fulltext document: PDF;
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.388-90
- CERN library copies
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